Question

Why are seeds of some grass are apomictic

Answer 1

The seeds of some grasses develop seeds without fertilisation. It may be because a diploid egg cell develops into a embryo directly (without undergoing meiosis and syngamy) or some diploid cells of nucellus or integument surrounding the embryo sac, protrude inside and develop into embryos. This phenomenon of developing embryo and seeds without fertilisation is called apomixis and such seeds produced are referred to as apomictic.